What the smallest rubber wheels that can be turned by a Technic axle?

This is what I have so far

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Background: I'm building a GBC and I want to push the balls at speed across an open area. I plan to hide small spinning wheels in the opening they go through and assume that rubber tyres are the best solution.

  • There are some small tires that fit on half-bushings. – Alexander O'Mara Oct 29 at 2:04
up vote 5 down vote accepted

I think the smallest one in diameter is the tire 3641

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with the bush 4265c.

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Alternatively, you can use the tire 3139

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which has a smooth surface and also compatible (but a little bit loosely) with the same bush.

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